We are looking for an experienced API developer to create a backend system that handles user registration, QR code generation, points tracking, and automated SMS messaging, with integration to a Shopify store. Project Scope: User Registration & QR Generation: Generate a unique QR code for each user upon registration. QR codes can be scanned by other users to award points. Points System: Track user levels and points automatically. Support variable points based on user or QR code level. SMS Integration: Automatically send SMS for account confirmation, QR delivery, and points updates. Preferably using Twilio, MessageBird, or similar services. Shopify Integration: Sync user accounts and points with Shopify for product rewards or level unlocks. Requirements: Strong experience in API development (REST or GraphQL) Experience with QR code generation and tracking Experience with SMS API integration Experience with Shopify API is a plus Ability to provide documentation for future updates Deliverables: Fully functional API ready for integration Documentation for deployment and maintenance Example endpoints for QR generation, points tracking, and SMS